Ok not that good flamethrower and evil eye arn't the best choices but good choice with energy ball and will-o-whisp/toxic I didn't even think of toxic with my answer (But I won't copy by editing my answer and adding toxic in it)

Team with Dugtrio. Now you have plenty of time to boost your Speed stat. When you have high enough Speed, you can then either set up Substitute to protect against Sucker Punch (the biggest threat) or you can choose to go for the Heatran and Blissey KO with Calm Mind. Shadow Ball and Hidden Power Fighting get perfect neutral coverage.

Shadow Tag is a huge part of this combo and you will see why. Swagger raises by two stages the foe's Attack and confuses. I normally switch into Blissey or Chansey, as they cannot do a single thing while i keep using Swagger. I then use Psych Up to copy all the Stat raises. Flame Charge is to correct his low Speed and is STAB. The last moveslot is all up to you. Astonish is a terrible move but is some Ghost STAB. Frustration and Return do some decent damage. Payback is just some normal damage. Giga Impact hits tremendously hard but there is that recharging that's very annoying. Last but not least, you could use Substitute on him for blocking Status. Life Orb is the preffered Item for hard-hitting but Lefties can be used for healing the damage that you receive.

P.S: What ever you choose in the last moveslot, Heatran is the best counter. If you choose Substitute, he completely walls you. Fortunately, he is rare in DW Ubers.

Shadow Ball is STAB and has accuracy definitely reliable.
STAB Fire Blast hits ridiculously hard coming off of Chandelure's base 145 Sp.Atk stat, And Life Orb boosted.
Energy Ball is used to hit water and rock types, Mainly. Completely destroys Gastrodon and the likes.
Hidden Power Ice hits Dragons for super effective damage, But doesn't really have any other use outside of that.
Pain Split works well with Chandelure's good base 90 defenses and "eh" 60 base HP stats.

Telekinesis and wide lens helps with Inferno, which in turn powers up Hex, giving the foe massive damage. Protect is for the burn to hurt the opponent more, and shadow tag ensures that he cannot switch